276856321 has 9 divisors (see below), whose sum is σ = 322192899. Its totient is φ = 237205584.

The previous prime is 276856297. The next prime is 276856331. The reversal of 276856321 is 123658672.

The square root of 276856321 is 16639.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 109516225 + 167340096 = 10465^2 + 12936^2 .

It is not a de Polignac number, because 276856321 - 2⁵ = 276856289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (276856331) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 115285 + ... + 117661.

It is an arithmetic number, because the mean of its divisors is an integer number (35799211).

Almost surely, 2^276856321 is an apocalyptic number.

276856321 is the 16639-th square number.

276856321 is the 8320-th centered octagonal number.

It is an amenable number.

276856321 is a deficient number, since it is larger than the sum of its proper divisors (45336578).

276856321 is an frugal number, since it uses more digits than its factorization.

276856321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768 (or 2384 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The cubic root of 276856321 is about 651.7556646859.

The spelling of 276856321 in words is "two hundred seventy-six million, eight hundred fifty-six thousand, three hundred twenty-one".